how do the number of muscle spindles vary according to skeletal muscle function?

the larger the force with less precision the fewer spindles needed

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what is the difference between intrafusal muscle fibres and normal skeletal ones?

intrafusal muscle fibres are smaller in diameter than normal skeletal fibres and are enclosed within connective tissue capsule, central region of fibres innervated by 1A sensory afferent axon, with the axon terminating around each intrafusal fibre